//This function is used to switch language of current page between English and Vietnamese
function changeLanguage(){
  var strLink = document.location.href;
  var strLocation = "";
  var strFileName = "";  
  var strLanguage = "";
  var intPos = strLink.indexOf('/', 8) + 1;
  strLocation = strLink.substring(0, intPos);  
  strFileName = strLink.substring(intPos);

  strLanguage = strFileName.substring(0, 2);
  if(strLanguage.toUpperCase() == "VN"){
    strFileName = strFileName.substring(2, strFileName.length);
    document.location.href = strLocation + strFileName;
  } else
    document.location.href = strLocation + 'vn' + strFileName;
}